There is no publicly available, reliable way to predict the exact time a tsunami will hit Japan, and no future tsunami landfall time is known in advance like a weather forecast. Any precise time someone gives you (for example, “it will hit at 3:15 pm”) should not be trusted unless it comes from official Japanese or international warning agencies.
What is known right now
Reports from December 8–9, 2025 indicate that a strong offshore earthquake triggered tsunami warnings and advisories for parts of northern Japan, but those advisories have since been lifted after only relatively small waves were observed. The Japan Meteorological Agency (JMA) and other authorities are warning that there is an increased chance of another large earthquake and possible tsunami along the Pacific coast over the coming week, and they are urging people in affected areas to stay prepared and ready to evacuate quickly if new warnings are issued.
What you should do now
If you are in Japan or near a coast:
- Check official, real-time information sources such as the Japan Meteorological Agency, NHK, local government websites, or official disaster apps for the latest tsunami and earthquake alerts.
- If a tsunami warning or major advisory is in effect for your area, move immediately to higher ground or a designated evacuation site and follow local authority instructions, without waiting to “see” the wave.
- If you feel strong or long-lasting shaking near the coast and cannot get information quickly, evacuate to higher ground as a precaution.
Because tsunami conditions can change quickly, always rely on current official alerts rather than predictions from non-official sources or social media.
